This JavaScript exception null (or undefined) has no properties that occur if there is an attempt to access properties of null and undefined. They don’t have any such properties.
Message:
TypeError: Unable to get property {x} of undefined or null reference (Edge)
TypeError: null has no properties (Firefox)
TypeError: undefined has no properties (Firefox)
Error Type:
TypeError
Cause of Error: Somewhere, there is access to properties of null or undefined.
Example 1: In this example, the variable(‘GFG’) is assigned the null value and It doesn’t have any property, So the error has occurred.
Javascript
let GFG = null;console.log(GFG.prop_name); |
Output(In Edge console):
TypeError: Unable to get property 'prop_name' of undefined or null reference
Example 2: In this example, the variable(‘var_name’) is assigned the undefined value and It doesn’t have any property, So the error has occurred.
Javascript
let var_name = undefined;console.log(var_name.prop_name); |
Output(In Edge console):
TypeError: Unable to get property 'prop_name' of undefined or null reference
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